Usage:
Cleaning.
General.
NOTE: Replace all oil seals, gaskets, O-rings, lock plates, piston rings, seal rings, etc., as a part of any maintenance or overhaul procedure.
1. Using Stoddard solvent (or equivalent) or steam cleaning, clean all parts. Parts cleaned with solvent or steam cleaned must be dried and oiled immediately.
2. Examine all parts carefully for grit, dirt and abrasives and reclean them if necessary.
3. Clean all oil passages by working a piece of wire back and forth through the passages and then flushing them with cleaning solvent.
4. Use clean solvent to flush oil pumps, valves, etc.
5. Flush all hoses, tubing, coolers, etc., particularly if the unit is being disassembled due to an internal failure.
Cleaning bearings.
Do not remove grease in which new bearings are packed. Thoroughly wash bearings that have been in service in clean solvent. Soak bearing in solvent if they are particularly dirty or filled with hardened grease.
| NOTICE |
|---|
Never dry bearing with compressed air. Do not spin bearings while they are not lubricated. Oil bearings with SAE 10 engine oil immediately after cleaning. Be sure bearings are oiled before inspection. |
Preventing entrance of dirt into bearings.
Dirt and grit in bearings are often responsible for bearing failure; consequently, it is important to keep bearings clean. Do not remove grease from new bearings. keep the wrapper on new bearings until they are to be installed. Do not expose clean bearings if they are not to be assembled at once. Wrap them with a clean lintfree cloth or paper to keep out dust.
Previously sealed joints.
1. For previously sealed joints, scrape surfaces to remove old gasket material. Gel-type paint removers containing methylene chloride can be used to wipe off cured sealant.
2. Clean surfaces with a suitable solvent to remove oil and grease residue.
3. Test for clean surfaces by applying a few drops of cool water to the surfaces. Parts are sufficiently clean if water covers the surface of the part in a film. If the water puddles or forms beads, use fresh solvent and reclean.
Inspection.
Housings, Cast parts, and Machined surfaces.
1. Replace cast parts or housings that are cracked.
2. Inspect bores for wear, grooves, scratches and dirt. Remove burrs and scratches with crocus cloth or soft stone. Replace parts that are deeply grooved or scratched.
3. Inspect oil passages for obstructions. If an obstruction is found, remove it with compressed air or by working a wire back and forth through the passage and flushing it with solvent.
4. Inspect machined surfaces for burrs, scratches, nicks and foreign matter. If such defects cannot be removed with crocus cloth or a soft stone, replace the part.
5. Inspect threaded openings for damaged threads. Chase damaged threads with a tap of the correct size.
6. Inspect studs for damaged threads and looseness. Replace defective studs.
7. Inspect dowel pins for wear or damage. Replace defective dowels. This applies where matched set of parts is not involved.
8. Inspect dowel pins holes for wear due to movement between mating parts. If a dowel pin hole is worn, rebore and sleeve the hole when possible. Otherwise, replace the parts. This applies where matched set of parts is not involved.
Valve seats.
Inspect valve seats for burrs, nicks and scratches. If these defects cannot be removed with a crocus cloth, replace the part. Check to see that the valve is seating properly after reworking the valve seat.
Bearings.
1. Inspect bearings for roughness of rotation. Replace the bearing if the rotation is rough.
2. Inspect bearings for corrosion, scored, scratched, cracked, pitted or chipped races, and for indication of excessive wear of balls or rollers. If one of these defects is found, replace the bearing.
3. Inspect bearing bores and shafts for grooved, burred, or galled conditions that would indicate that the bearing has been turning in its housing or on its shaft. If the damage cannot be repaired with a crocus cloth, replace the part.
Bushings and sleeves
Inspect bushings for size and out-of-roundness, scores, burrs, sharp edges, and evidence of overheating. Remove scores with a crocus cloth. If the bushing is out-of-round, deeply scored, or excessively worn, replace it.
Thrust washers and spacers
Inspect thrust washers for distortion, scores, burrs and wear. Rework or replace any defective thrust washers or spacers.
Gears
1. Inspect gears for scuffed, nicked, burred or broken teeth. If the defect cannot be removed with a soft stone, replace the gear.
2. Inspect gear teeth for wear that may have destroyed the original tooth shape. If this condition is found, replace the gear.
3. Inspect thrust faces of gears for scores, scraches and burrs. If these defects cannot be removed with a soft stone, replace the gear.
Splined parts
Inspect splined parts for stripped, twisted, chipped or burred splines. Burrs may be removed with a soft stone, otherwise the part must be replaced.
Snap rings
Replace damaged or distorted snap rings.
Springs
Inspect springs for broken or distorted coils. Replace the spring if either of these defects are found.
Flexible hoses
Inspect flexible hoses for cracks and sponginess. Replace damaged hoses.
Electrical cables and/or connectors
Inspect cables for damage and proper routing and supporting. Replace damaged cables, clamps or supporting brackets. Inspect cable connectors. Replace damaged connectors if cable is serviceable, otherwise, replace complete cable assembly.